Month: June 2018

A. core built-up of laminations of cold rolled grain oriented steel
B. core built-up of laminations of hot rolled sheet
C. either of the above
D. none of the above

A. zoom
B. hum
C. ringing
D. buzz

A. Bushings
B. Core
C. Primary winding
D. Secondary winding

A. Cellulose
B. Asbestos
C. Mica
D. Glass fibre

A. short-circuit test
B. back-to-back test
C. open circuit test
D. any of the above

A. Horn gaps
B. Thermal overload relays
C. Breather
D. Conservator

A good voltage regulation of a transformer means
A. output voltage fluctuation from no load to full load is least
B. output voltage fluctuation with power factor is least
C. difference between primary and secondary voltage is least
D. difference between primary and secondary voltage is maximum

A. Overfluxing protection
B. Buchholz relay
C. Overcurrent protection
D. All of the above

A. 0.8 leading power factor
B. 0.8 lagging power factor
C. zero power factor
D. unity power factor

A. voltage
B. current
C. current and voltage
D. power